No, the match making algorithm can be perfect but because players are not perfect it will NEVER be even, and hence 1.0 KD is a myth.
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Each match should end with 51 vs 49 kills. Thus 1.0
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You are missing the point. It is impossible to create a 51vs49 match every match. Players are not perfect. Players are inconsistent. Players are inconsistent at different times.
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They can manipulate damage